scholarly journals CeZrOx Promoted Water-Gas Shift Reaction under Steam–Methane Reforming Conditions on Ni-HTASO5

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1110
Author(s):  
Qing Zhao ◽  
Ye Wang ◽  
Guiying Li ◽  
Changwei Hu
Keyword(s):  
Strong Acid ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Water Gas Shift ◽  
Methane Reforming ◽  
Impregnation Method ◽  
Steam Methane Reforming ◽  
Steam Methane ◽  
Shift Reaction ◽  
Water Gas

Ni-based catalysts (Ni-γ-Al2O3, Ni-HTASO5 and Ni-CeZrOx) were prepared by impregnation method and characterized by BET, AAS, XRD, H2-TPR, CO-TPD, NH3-TPD, XPS, TG-DSC-MS and Raman spectroscopies. Using CeZrOx-modified Al2O3 (HTASO5) as support, the catalyst exhibited good catalytic performance (TOFCH4 = 8.0 × 10−2 s−1, TOFH2 = 10.5 × 10−2 s−1) and carbon resistance for steam-methane reforming (SMR) reaction. Moreover, CeZrOx was able to enhance water-gas shift (WGS) reaction for more hydrogen production. It was found that the addition of CeZrOx could increase the content of active nickel precursor on the surface of the catalyst, which was beneficial to the decomposition of water and methane on Ni-HTASO5. Furthermore, Ni-HTASO5 could decrease the strong acid sites of the catalyst, which would not only contribute to the formation of low graphited carbon, but also decrease the amount of carbon deposition.

scholarly journals Upgrading of Bio-Syngas via Steam-CO2 Reforming Using Rh/Alumina Monolith Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 180
Author(s):  
Woo Jin Lee ◽  
Chaoen Li ◽  
Jim Patel
Keyword(s):  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Co2 Reforming ◽  
Steam Methane Reforming ◽  
Steam Methane ◽  
Reverse Water Gas Shift ◽  
Shift Reaction ◽  
Water Gas ◽  
Monolith Catalysts ◽  
Substantial Change

Steam-CO2 reforming of biomass derived synthesis gas (bio-syngas) was investigated with regard to the steam concentration in the feed using Rh-loaded alumina foam monolith catalysts, which was also accompanied by thermodynamic equilibrium calculation. With 40 vol % steam addition, steam methane reforming and water gas shift reaction were prevailed at the temperature below 640 °C, above which methane dry reforming and reverse-water gas shift reaction were intensified. Substantial change of activation energy based on the methane conversion was observed at 640 °C, where the reaction seemed to be shifted from the kinetic controlled region to the mass transfer controlled region. At the reduced steam of 20 vol %, the increase in the gas velocity led to the increase in the contribution of steam reforming. Comparing to the absence of steam, the addition of steam (40 vol %) resulted in the increase in the production of H2 and CO2, which in turn increased the H2/CO ratio by 95% and decreased the CO/CO2 ratio by 60%. Rh-loaded alumina monolith was revealed to have a good stability in upgrading of the raw bio-syngas.

Numerical Evaluation and Comparison of Different Reduced Mechanisms for Predicting the Performance of a SOFC Operating on Coal Syngas

2008 ◽  
Author(s):  
Francisco Elizalde-Blancas ◽  
Suryanarayana R. Pakalapati ◽  
Jose A. Escobar-Vargas ◽  
Ismail B. Celik
Keyword(s):  
A Priori ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Methane Reforming ◽  
Coal Syngas ◽  
Steam Methane Reforming ◽  
Steam Methane ◽  
Catalyzed Reactions ◽  
Shift Reaction ◽  
Water Gas

Three-dimensional numerical simulations of an anode supported button solid oxide fuel cell were performed using the code developed in house DREAM SOFC. The cell operates on coal syngas at atmospheric pressure and 1073 K. A gas phase mechanism and a heterogeneous mechanism are studied in this work to assess their influence on the performance of the button cell. Both mechanisms take into account the steam methane reforming reaction and water gas shift reaction. The implemented electrochemistry model allows the cell to simultaneously electrochemically oxidize H2 and CO. Results show that methane reforming from the bulk reactions is negligible compared to the catalyzed reactions. Also with a higher reformation the power delivered by the cell is improved. A small temperature difference of one degree is observed when both mechanisms are compared. The electrochemistry model does not require the ratio between current produced from H2 and CO to be prescribed a priori as an input. Under the operating conditions used in this study the model predicts the ratio to be around 4 for both mechanisms.

Estimation of the remaining lifetime of deactivated catalyst via the spatial average catalyst activity illustrated by the water–gas shift and steam methane reforming processes

2017 ◽  
Vol 121 (2) ◽  
pp. 371-385 ◽  
Author(s):  
Phungphai Phanawadee ◽  
Khingkhan Laipraseard ◽  
Gregory S. Yablonsky ◽  
Denis Constales ◽  
Wanwilai Jamroonrote ◽  
...  
Keyword(s):  
Catalyst Activity ◽  
Water Gas Shift ◽  
Methane Reforming ◽  
Spatial Average ◽  
Steam Methane Reforming ◽  
Steam Methane ◽  
Water Gas

scholarly journals Pengaruh Komposisi Massa Bahan Baku dan Temperatur pada Steam Reformer terhadap Jumlah Produksi Bio-Hydrogen dengan Menggunakan Software ASPEN HYSYS V.10.0

2018 ◽  
Vol 2 (1) ◽  
pp. 24
Author(s):  
Rizki Kurnia Dermawan ◽  
Rif'an Fathoni ◽  
Anton Irawan
Keyword(s):  
Steam Reforming ◽  
Water Gas Shift ◽  
Methane Reforming ◽  
Steam Reformer ◽  
Steam Methane Reforming ◽  
Aspen Hysys ◽  
Steam Methane ◽  
Bio Oil ◽  
Water Gas

Proses pada pabrik bio hidrogen dari bio oil terbagi menjadi beberapa unit, yaitu unit dehidrooksigenasi, unit pemisahan, unit steam reforming, unit water gas shift, dan unit pemurnian. Penelitian ini menjelaskan tentangpengaruh perbandingan komposisi massa metana (CH4) dengan steam (H2O) serta pengaruh perbedaan temperatur pada unit steam methane reforming untuk melihat pengaruh pada produksi bio hidrogen. Penelitian ini dikerjakan menggunakan software simulasi proses Aspen Hysys v.10.0. Dengan menggunakan variabel temperatur pada steam reformer (800 °C, 850 °C, 900 °C, 950 °C, 1000 °C) dan variabel perbandingan komposisi massa steam dengan methane (CH4), yaitu 1:2, 1:1,25, 1:3, 1:3,5, 1:4. Dari penelitian yang dilakukan didapatkan pengaruh komposisi steam dan metana berbanding lurus dengan jumlah bio hidrogen yang dihasilkan. Serta, pengaruh perbedaan temperatur pada reaktor steam reformer berbanding lurus dengan jumlah produksi hidrogen. Dari hasil penelitian didapatkan jumlah produksi bio hidrogen terbaik 1300 kg/jam.Kata kunci: Aspen HYSYS, Bio Oil, Bio Hidrogen

Advanced Exergetic Analysis of Chemical Processes

2009 ◽  
Author(s):  
A. Boyano ◽  
G. Tsatsaronis ◽  
T. Morosuk ◽  
A. M. Blanco-Marigorta
Keyword(s):  
Chemical Reactions ◽  
Chemical Processes ◽  
Methane Reforming ◽  
Exergy Destruction ◽  
Steam Methane Reforming ◽  
Steam Methane ◽  
Production Of Hydrogen ◽  
Exergetic Analysis ◽  
Shift Reaction ◽  
Water Gas

In this paper, a steam methane reforming (SMR) process for the production of hydrogen is studied. The process is based on two chemical reactions (reforming and water-gas-shift reaction). For each component but especially focusing on the chemical reactors, the avoidable part of the exergy destruction is estimated. The assumptions required for these calculations are discussed in detail and represent the main contribution of this work to the development of exergy-based methods for the analysis of chemical processes. In an advanced exergy analysis, the exergy destruction within a component is split into avoidable/unavoidable parts. This splitting improves understanding of the sources of thermodynamic inefficiencies and facilitates a subsequent optimization of the overall process. The overall SMR process is characterized by high energetic and exergetic efficiencies. However, the majority of the exergy destruction is caused by the irreversibility of chemical reactions and heat transfer. Results of this paper suggest options for improving the efficiency of the overall process.

scholarly journals Effect of cold Ar plasma treatment on the catalytic performance of Pt/CeO2 in water-gas shift reaction (WGS)

2018 ◽  
Vol 225 ◽  
pp. 121-127 ◽  
Author(s):  
Laura Pastor-Pérez ◽  
Victor Belda-Alcázar ◽  
Carlo Marini ◽  
M. Mercedes Pastor-Blas ◽  
Antonio Sepúlveda-Escribano ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Catalytic Performance ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Ar Plasma ◽  
Shift Reaction ◽  
Water Gas
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