Deactivation kinetics of platinum-based catalysts in dehydrogenation of higher alkanes

Optimization of Higher Alkanes Dehydrogenation Process under Conditions of Decreased Hydrogen Containing Gas Flow with Using Mathematical Modeling

“…Taking into account the specific character of the dehydrogenation reaction, the process is better to be kept at lower pressure, which is formed exactly by ratio hydrogen/feedstock. After decreasing molar ratio, the increase in the target product -alkenes -is observed; however, along with that, the decreasing rate of hydrogenation by-products by hydrogen and, as a result, the increasing rate of catalyst dehydrogenation by coke is observed [21][22][23][24][25][26].…”

“…As far as dehydrogenation process is catalytic, and as catalyst is used Pt, coating Al 2 O 3 , keeping the catalyst active is the main task for chemists-technologists under conditions of intensive coke-generating [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Kinetic Model of Heavy Paraffins Dehydrogenation

“…The following mono-olefins dehydrogenation to diolefins is the main side reaction (Chen, 1994). According to preliminary calculation and relevant literature (Saeedizad et al, 2009), the rate of mono-olefins dehydrogenating to diolefins is far less than that of heavy paraffins dehydrogenating to mono-olefins, so the influence of mono-olefins dehydrogenating to diolefins can be neglected and only heavy paraffins dehydrogenating to mono-olefins was considered in this paper. This study focused on researching the influence of carbon number on heavy paraffins dehydrogenating to mono-olefins.…”

“…Some researchers took catalyst deactivation into consideration. Zhang et al (1983) studied apparent kinetics and deactivation kinetics of heavy paraffins dehydrogenation in adiabatic fixed bed reactor, but the model parameters were calculated Saeedizad et al (2009) studied the deactivation of promoted Pt-Al 2 O 3 catalyst in dehydrogenation of C 10 − C 14 heavy paraffins to corresponding mono-olefins and found out the deactivation order of catalyst deactivation.…”

Performance of Ethane Dehydrogenation over PtSn Loaded onto a Calcined Mg(Al)O LDH with Three Mg:Al Molar Ratios Using a Novel Method

“…Platinum is widely studied for its use in the dehydrogenation of light alkanes. However, when only Pt is loaded onto the supports, there exists low olefin selectivity, and the rapid deactivation of catalysts occurs [5][6][7][8][9]. It was found that the addition of Sn can suppress the coking reaction, as well as decrease the sintering of the metal, further inhibiting the deactivation of catalysts [10][11][12][13].…”