The effect of adsorbent characteristics on the performance of a continuous sorption-enhanced steam methane reforming process

Kinetic and structural requirements for a CO2 adsorbent in sorption enhanced catalytic reforming of methane – Part I: Reaction kinetics and sorbent capacity

“…The CO 2 rate of adsorption on the hydrotalcite sorbent is represented by the linear driving force model (LDF). Molecular diffusion and surface diffusion are found to be insignificant in comparison to pore diffusion [6][7][8][9][10][11][26][27][28][29]. Therefore, the effective mass transfer coefficient, appearing in the LDF model, considers the intraparticle mass transfer limitation which is controlled by internal pore diffusion.…”

“…A conventional Ni-based steam reforming catalyst and hydrotalcite sorbent are used in several modeling studies to theoretically demonstrate the performance of sorption-enhanced steam reforming process [5][6][7][8][9][10][26][27][28]. Xiu et al [6] simulated the process in a five-step, one fixed bed reactor using a multi-component system with overall mass and energy balances, pressure drop, and nonlinear adsorption equilibrium for CO 2 over hydrotalcite.…”

Effect of catalyst activity in SMR-SERP for hydrogen production: Commercial vs. large-pore catalyst

“…Steam methane reforming Water-gas shift Calcium oxides (Balasubramanian et al, 1999;Ortiz and Harrison, 2001;Peng and Harrison, 2003;Comas et al, 2004;Kwang and Harrison, 2005;Satrio et al, 2005;Hildenbrand et al, 2006;Li et al, 2006) Lithium oxides (Ochoa-Fernandez et al, 2005;Ochoa-Fernandez et al, 2007;Rusten et al, 2007aRusten et al, , 2007bEssaki et al, 2008) Hydrotalcite (Mayorga et al, 1997;Hufton et al, 1999;Ding and Alpay, 2000;Waldron et al, 2001;Xiu et al, 2002aXiu et al, , 2002bXiu et al, , 2003aXiu et al, , 2003bXiu et al, , 2004Lee et al, 2006;Reijers et al, 2006;Cobden et al, 2007;Koumpouras et al, 2007aKoumpouras et al, , 2007bLee et al, 2007a, 2007c, 2008b) (van Selow et al, 2009Wright et al, 2009) Sodium oxides (Lee et al, 2007b;Bretado et al, 2008;Lee et al, 2008a) In order to determine the response of the layered system to different operating conditions (total pressure, feed temperature and feed flowrate), six experimental runs were performed using catalyst (Catalyst A or Degussa) and sorbent (MG30-K). The operating conditions of each of the experimental runs are reported in Table 4.…”

Reactor modeling of sorption-enhanced autothermal reforming of methane. Part I: Performance study of hydrotalcite and lithium zirconate-based processes

“…There are significant attempts made to theoretically understand the process performance [11][12][13][14][15][16][17][18]. Xiu et al [11] developed a mathematical model to describe the sorption-enhanced SR in a fixed bed.…”

“…At particle scale, they highlighted the role of the catalyst to sorbent distribution inside the particle and the ratio of pore radius to tortuosity. Koumpouras et al [17,18] modeled a reactorregenerator in which the adsorbent particles are passed through a stationary SR catalyst monolith. They concluded that the CH 4 conversion enhancement and CO 2 recovery show a strongly nonlinear dependency on both sorption capacity and kinetics.…”