Hao Qin

• Shandong Normal University

Photoreduction carbon dioxide to hydrocarbons has been recognized as one of the most promising and sustainable solutions to realize solar-to-chemical energy conversion and alleviate environmental pollution. Herein, we prepared g-C3N4 photocatalyst modified by NiS2 quantum dots as co-catalyst based on a seed-mediated hydrothermal process. The compos...

In this work, the effect of (NH4)2CO3 additive on the combustion behavior and NOx emission properties during the combustion process of semi-coke was investigated. The combustion characteristics of semi-coke with/without (NH4)2CO3 were investigated in a thermogravimetric analyzer. Several parameters including the ignition and the burnout temperature...

In this work, NO removal process by using sodium persulfate/limestone slurry was investigated. Based on the response surface methodology, the effects of operation parameters, including reaction temperature, sodium persulfate concentration, initial concentration of NO and the concentration of transition metal ions, on NO removal efficiency were inve...

Bi2S3 quantum dots (QDs) /g-C3N4 composites with various Bi2S3 QDs contents were synthesized by hydrothermal reaction method and used in CO2 photocatalytic reduction, which demonstrated much higher photocatalytic activity than pristine g-C3N4. Experimental results indicated that the 20 wt% Bi2S3 QDs/g-C3N4 showed a remarkable photocatalytic activit...

A novel ball-flowerlike catalyst (CoMnOx-BF) was developed by hydrothermal method for the selective catalytic reduction (SCR) of NOx by NH3. Besides, a counterpart sample (CoMnOx) was prepared by coprecipitation way for comparison. The activity test results demonstrated that CoMnOx-BF catalyst exhibited admirable SCR performance and N2 selectivity...

Developing new photocatalysts to improve photocatalytic performance is of great importance for dealing with environmental crisis. In this work, disc-shaped Bi2O2(OH)NO3/g-C3N4 nanosheets (BON-CN) were successfully synthesized by one-step hydrothermal method. Among them, 20wt% BON-CN composite demonstrated much better performance for CO2 photocataly...

A sequence of Cr-modified CeZr 2 O x catalysts were synthesized through the co-precipitation way and applied in selective catalytic reduction (SCR) of NO x with ammonia. The optimal catalyst (Cr 1 CeZr 2 O x ) exhibited the excellent NH 3 -SCR activity and high SO 2 resistance. From the characterization results, Cr species in Cr 1 CeZr 2 O x could...

Sb-modified Mn/TiO 2 catalyst synthetized by sol–gel method exhibited outstanding performance in simultaneous Hg ⁰ oxidation and NO reduction under SCR conditions at low temperature. NO removal (>90%) and Hg ⁰ oxidation (>80%) were simultaneously obtained over MnSb/TiO 2 -0.25 catalyst in 200–300 °C with a GHSV of 54,000 h ⁻¹ . Moreover, MnSb/TiO 2...

The MoS 2 /TiO 2 heterojunction composites photocatalysts exhibits excellent photocatalytic performance, and they were resoundingly synthesized by a one-step hydrothermal experimental method combined with mild calcination (300 °C) under an argon atmosphere. Under the visible light irradiation, the photocatalytic activity of MoS 2 /TiO 2 heterojunct...

Potassium, as one of the alkali metals, could cause significant deactivation on the Ce-based SCR catalysts. In this work, Zr-doping was found to efficiently enhance the K tolerance of Ce/TiO2 catalyst. The BET, XRD, Raman, XPS, H2-TPR, NH3-TPD, O2-TPD and NOx-TPD were adopted for exploring the mechanism of the promoted anti-K-poisoning property of...

The Cu/TiO2 catalysts modified by Sb were compounded through the sol-gel way and put into use for the selective catalytic reduction (SCR) of NOx with NH3. Experimental results suggested that CuSb/TiO2-0.4 exhibited the excellent NOx conversion and SO2 tolerance. Subsequently, the relationship between surface physicochemical properties and catalytic...

Removal of NO and Hg⁰ simultaneously was achieved on Nb-modified MnTiOx catalyst. Experimental results revealed that high NO conversion (>95%) and Hg⁰ oxidation (>95%) in 200–300 °C were available on Mn0.15Nb0.02TiOx catalyst with a GHSV of 108,000 h⁻¹. The excellent catalytic performance of Mn0.15Nb0.02TiOx catalyst should be originated from its h...

The Z-scheme MoS2/g-C3N4 heterojunction photocatalysts were fabricated using a hydrothermal deposition procedure together with a calcination route, and were applied for CO2 photoreduction. Experimental results indicated that the 10% MoS2/g-C3N4 heterojunction displayed the best photocatalytic performance. Furthermore, the maximum CO yields of 58.59...

In present study, the poisoning mechanism of Cl on V/TiO2 catalyst for SCR removal of NOx using NH3 as the reductant was explored by in situ DRIFT technique. The experimental results revealed that the existence of Cl did not change the SCR reaction mechanism over V/TiO2 catalyst, which was mainly under the control of both E-R and L-H mechanisms. Th...

The one dimension (1D) TiO2 nanotubes and nanorods were successfully prepared via a one-step hydrothermal method. The structure and properties of the catalysts were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), E...

In this study, NH3 treatment of CeO2 was found to significantly enhance its NH3-SCR performance. The NH3-treated CeO2 was characterized by BET, XRD, TPR and XPS. The obtained results revealed the excellent SCR activity and stability of CeO2 catalyst treated by NH3 should be originated from the dropped crystallinity, better reducibility, along with...

The Eu-doped TiO2 nanoparticles were successfully prepared by a simple sol-gel method. The properties of the catalysts were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectrometer (EDS), N2 adsorption-desorption, UV–vis diffuse reflectance and phot...

In this work, Mo-modified Mn/TiO2 catalysts synthetized by co-precipitation method were applied in the SCR abatement of NOx by NH3. Ranging from 50 to 400 °C, Mn/TiO2 modified with Mo showed higher efficiency in SCR reaction than Mn/TiO2 without Mo. Among Mn/TiO2 catalysts with different Mo doping amount, MnMo/TiO2-0.04 catalyst showed not only the...

We realize a pair of simultaneous ten-step one-dimensional quantum walks with two walkers sharing coins, which we prove is analogous to the ten-step two-dimensional quantum walk with a single walker holding a four-dimensional coin. Our experiment demonstrates a ten-step quantum walk over an 11x11 two-dimensional lattice with a line defect, thereby...

We introduce and analyze a one-dimensional quantum walk with two time-independent rotations on the coin. We study the influence on the property of quantum walk due to the second rotation on the coin. Based on the asymptotic solution in the long time limit, a ballistic behaviour of this walk is observed. This quantum walk retains the quadratic growt...

We implement a quantum walk in phase space with a new mechanism based on the superconducting resonator-assisted double quantum dots. By analyzing the hybrid system, we obtain the necessary factors of realization of a quantum walk in phase space: the walker, coin, coin flipping and conditional phase shift. In order to implement the coin flipping ope...

We realize a pair of simultaneous ten-step one-dimensional quantum walks with two walkers sharing coins, which we prove is analogous to the ten-step two-dimensional quantum walk with a single walker holding a four-dimensional coin. Our experiment demonstrates a ten-step quantum walk over an 11×11 two-dimensional lattice with a line defect, thereby...

Quantum algorithm acts as an important role in quantum computation science, not only for providing a great vision for solving classically unsolvable problems, but also due to the fact that it gives a potential way of understanding quantum physics. We experimentally realize a quantum speed-up algorithm with a single qudit via linear optics and prove...

Is a violation of Kochen-Specker (KS) non-contextuality inequality a tight bound to rule out the non-contextual hidden variable theory? A test designed by Liang, Spekkens and Wiseman (LSW) provides a more stringent bound and a violation of a generalized non-contextuality inequality such as LSW inequality rules out more generalized non-contextual mo...

We demonstrate a quantum walk with time-dependent coin bias. With this technique we realize an experimental single-photon one-dimensional quantum walk with a linearly ramped time-dependent coin flip operation and thereby demonstrate two periodic revivals of the walker distribution. In our beam-displacer interferometer, the walk corresponds to movem...

We perform generalized measurements of a qubit by realizing the qubit as a coin in a photonic quantum walk and subjecting the walker to projective measurements. Our experimental technique can be used to realize photonically any rank-1 single-qubit positive operator-valued measure via constructing an appropriate interferometric quantum-walk network...

Symmetric informationally complete positive operator-valued measurement (SIC-POVM) is one important class of quantum measurement which is crucial for various quantum information processing tasks. SIC-POVMs have the advantage of providing an unbiased estimator for quantum states with the minimal number of outcomes needed for full tomography. We pres...

We demonstrate an implementation of unambiguous state discrimination of two equally probable single-qubit states via a one-dimensional photonic quantum walk experimentally. Furthermore we experimentally realize a quantum walk algorithm for implementing a generalized measurement in terms of positive operator value measurement on a single qubit. The...

We show a perfect state transfer of an arbitrary unknown two-qubit state can be achieved via a discrete-time quantum walk with various settings of coin flippings, and extend this method to distribution of an arbitrary unknown multi-qubit entangled state between every pair of sites in the multi-dimensional network. Furthermore, we study the routing...

We realize quasi-periodic dynamics of a quantum walker over 2.5 quasi-periods by realizing the walker as a single photon passing through a quantum-walk optical-interferometer network. We introduce fully controllable polarization-independent phase shifters in each optical path to realize arbitrary site-dependent phase shifts, and we employ large cle...

Optical interferometers comprising birefringent-crystal beam displacers, wave plates, and phase shifters serve as stable devices for simulating quantum information processes such as heralded coined quantum walks. Quantum walks are important for quantum algorithms, universal quantum computing circuits, quantum transport in complex systems, and demon...

Inspired by a recent theoretical and experimental scheme [Puentes et al., PRL 112, 120502 (2014)], we study the influence on the property of quantum walk due to the second rotation on the coin. Based on the exact solution to the first several steps, a ballistic behaviour of this walk is observed for a short time. In the long-time limit, we find sol...

Quantum walks have been investigated as they have remarkably different features in contrast to classical random walks. We present a quantum walk in a one-dimensional architecture, consisting of two coins and a walker whose evolution is in both position and phase spaces alternately controlled by the two coins respectively. By analyzing the dynamics...

This article aims to provide a review on quantum walks. Starting form a basic idea of discrete-time quantum walks, we will review the impact of disorder and decoherence on the properties of quantum walks. The evolution of the standard quantum walks is deterministic and disorder introduces randomness to the whole system and change interference patte...