Ammonium Hydroxide Reaction Paper

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Synthesis of a Mesoporous Silicoaluminophosphate (SAPO) Assembled in the Presence of Ammonium hydroxide: Prospective Catalyst for Trans-alkylation Arvind Kumar Singh,a Rekha Yadav, a Jeyaraj Christopher,b and Ayyamperumal Sakthivel *a *Department of Chemistry, Inorganic Materials and Catalysis Laboratory, University of Delhi, Delhi 110007. bIndian Oil Corporation Ltd, R&D Centre, Faridabad-121007. E-mail: / KEYWORDS: Meso/Micro Composite, SAPO, Trans-alkylation, Vapor phase treatment. ABSTRACT: An ordered mesoporous silicoaluminophosphate (M-S-34-N) was assembled for the first time in presence of ammonium hydroxide as the base and subsequently stabilized via vapor phase treatment.…show more content…
2. Both the samples exhibit the presence of type I and type IV isotherms [16-19]. The type I isotherm evident at relative pressures (p/po) of 0.1 corresponds to the microporous SBU precursor unit present on the mesopore walls. The distinct type IV isotherm also evident with the increase in adsorption in the region of p/po between 0.4 and 0.9 is due to capillary condensation in the mesopore [16-19. The key difference between the M-S-34-N and M-S-34-N-VPT isotherms is a steep increase in the adsorption quantity in the mesopore region of M-S-34-N-VPT owing to the formation of a uniform mesopore channel after VPT. The effect of vapour phase treatment is clearly evident in the textural properties summarized in Table 1. M-S-34-N had a BET surface area and pore volume of 444 m2 g‒1 and 0.6 cm3 g‒1, respectively. The significant increase in these properties after VPT to 621 m2 g‒1 and 0.8 cm3 g‒1, respectively, clearly supports the formation of uniform mesoporosity in…show more content…
Microporous SAPO-34 is yield only about 1.2% conversion. The observed lower conversion on microporous SAPO-34 is due to its small pore openings, which restrict the bulk molecular diffusion. M-S-34-N showed a conversion of 10.7% with about 77% selectivity for mono-isopropyl naphthalene as the major product. The use of M-S-34-N-VPT enhanced the catalytic conversion increases to about ~18% with similar product selectivity. The observed higher conversion using M-S-34-N-VPT compared with M-S-34-N is a result of the long-range order and strong acidity present of the M-S-34-N-VPT surface. Importantly, the catalytic conversion remains almost the same, even after the second

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