Plug precursor assisted synthesis: A highly efficient method of tuning the acidic and structural properties of Al-SBA-15

Study on Mesoporous Al-SBA-15 with Enhanced Acidity and Hydrothermal Stability for Heavy Oil Hydrocracking Conversion

“…The trend was in good agreement with the BET result. The result was also in agreement with a study on SBA-15 silica synthesized by direct addition of PVA powder [15]. The mesoporous materials with highly ordered structure and thick wall generally showed the excellent thermal and hydrothermal stability.…”

“…Wang and his co-workers reported a highly ordered SBA-15 with thick pore wall and high hydrothermal stability, which was synthesized by adding PVA powder [14]. Studies showed that direct synthesis under acid-free or very mild acid conditions significantly enhanced the acidity and hydrothermal stability of the mesoporous materials, and thus more ordered wall structure may be formed [15][16][17]. Because different researches used various chemicals and synthesis conditions, it is hard to compare the effect of the initial acid concentration and silica-to-alumina ratio on the main properties of the synthesis Al-SBA-15.…”

A novel and facile strategy for synthesis plugged SBA-15

“…However, as-synthesized materials show different type hysteresis loops due to different pore types. The adsorption-desorption isotherms of PHTS-1 and PHTS-2 samples exhibit an H2-type hysteresis loop and a slow N 2 capillary condensation in the 0.40-0.74 P/P 0 , which can be indicated to the presence of the inkbottle-type pore structure [5][6][7][8][9][10][11][12][13][14][15], thereinto, the sample PHTS-1 is completed plugged pores material, and that PHTS-2 is partially plugged pores material [11]. From Figure 2a, the desorption branch of sample PHTS-3 shows two major capillary condensation steps in the relative pressure ranges from 0.40-0.50 P/P 0 and 0.55-0.65 P/P 0 , implying the pore blocking effect [5][6][7]10], and leading to the pore size distributions focus on about 3.9 nm and 5.4 nm, as can be identified from the corresponding pore size distribution curves ( Figure 2b).…”

“…These PHTS materials showed a tunable amount of open and plugged pores, a high micropore volume and more stability than conventional micelle templated structure materials [10]. Oliveira [12]. Plugged structure materials were an advantageous catalyst support and adsorbent, and had played an important role in the asymmetric addition and epoxidation reaction [13,14], isopropylation [15], decomposition [16], hydrodechlorination [17], oligomarization reaction [18] and hydrocarbons adsorption [19], and so forth.…”

Synthesis and Characterization of Cu Decorated Zeolite A@void@Et-PMO Nanocomposites for Removal of Methylene Blue by a Heterogeneous Fenton Reaction

“…The degradation reaction occurs via generating massive free hydroxyl radical (•OH) from hydrogen peroxide with the presence of metal catalysts, which is the essential parts of the Fenton reaction [9][10][11]. For degradation reaction, the synergy of the adsorption process is attributed to increasing the degradation efficiency [12]. In other words, it is desirable to obtain multi-functional catalysts through architecturing with enhanced activities both on adsorption and catalysis.…”