Endothermic processes for producing hydrogen using autothermal microchannel reactor technology by steam reforming

<strong>Endothermic processes for producing hydrogen using autothermal microchannel reactor technology by steam reforming</strong> Junjie Chen Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: [e-mail] A chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. Chemical reactions must be distinguished from physical changes. Physical changes include changes of state, such as ice melting to water and water evaporating to vapour. If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same. No matter what its physical state, water is the same compound, with each molecule composed of two atoms of hydrogen and one atom of oxygen. However, if water, as ice, liquid, or vapour, encounters sodium metal, the atoms will be redistributed to give the new substances molecular hydrogen and sodium hydroxide. By this, a chemical change or reaction has occurred. When making a new substance from other substances, chemists say either that they carry out a synthesis or that they synthesize the new material. Reactants are converted to products, and the process is symbolized by a chemical equation. For example, iron and sulfur combine to form iron sulfide. Streamwise distance (meter), Heterogeneous reaction rate along the length of the reactor (mole per square meter per second) 0 13.8238 0.00025 13.829 0.0005 13.7686 0.00075 13.5966 0.001 13.3629 0.00125 13.1109 0.0015 12.8776 0.00175 12.6771 0.002 12.5024 0.00225 12.3324 0.0025 12.148 0.00275 11.9429 0.003 11.7223 0.00325 11.5024 0.0035 11.3004 0.00375 11.1228 0.004 10.9663 0.00425 10.8201 0.0045 10.6735 0.00475 10.5217 0.005 10.3666 0.00525 10.2161 0.0055 10.079 0.00575 9.9589 0.006 9.85332 0.00625 9.75492 0.0065 9.65697 0.00675 9.55649 0.007 9.45433 0.00725 9.35567 0.0075 9.26616 0.00775 9.18776 0.008 9.11867 0.00825 9.0535 0.0085 8.98726 0.00875 8.91821 0.009 8.84762 0.00925 8.77935 0.0095 8.71752 0.00975 8.66366 0.01 8.61548 0.01025 8.56872 0.0105 8.51959 0.01075 8.46699 0.011 8.41232 0.01125 8.35897 0.0115 8.31019 0.01175 8.26698 0.012 8.22767 0.01225 8.18823 0.0125 8.14529 0.01275 8.09866 0.013 8.04992 0.01325 8.00185 0.0135 7.95721 0.01375 7.91664 0.014 7.87854 0.01425 7.8395 0.0145 7.79682 0.01475 7.74993 0.015 7.70089 0.01525 7.65246 0.0155 7.6065 0.01575 7.56371 0.016 7.52264 0.01625 7.48033 0.0165 7.43432 0.01675 7.38447 0.017 7.33228 0.01725 7.28009 0.0175 7.22957 0.01775 7.18109 0.018 7.13374 0.01825 7.0847 0.0185 7.03187 0.01875 6.9754 0.019 6.91664 0.01925 6.85735 0.0195 6.79932 0.01975 6.74305 0.02 6.687 0.02025 6.62861 0.0205 6.56642 0.02075 6.50083 0.021 6.43312 0.02125 6.3647 0.0215 6.29672 0.02175 6.22942 0.022 6.16121 0.02225 6.09054 0.0225 &amp;nb