Hydrothermally Synthesized HZSM-5/SAPO-34 Composite Zeolite Catalyst for Ethanol Conversion to Propylene

Abstract

HZSM-5/SAPO-34 zeolite composites were prepared by hydrothermal synthesis (ZS-HS) and mechanical mixture (ZS-MM), respectively. ZS-HS showed higher propylene yield and better catalytic stability in ethanol conversion than ZS-MM as well as HZSM-5 and SAPO-34. In case of ZS-HS, SAPO-34 at least partially overlapped on HZSM-5, which resulted in the interfacial interaction of HZSM-5 and SAPO-34. Such interaction significantly modified the texture and the acidity of ZS-HS, which in turn affected its catalytic reactivity. ZS-HS showed the higher apparent formation rate of propylene, due to its moderate concentration and strength distribution of acid sites. Propylene, ethylene and butylenes might produce through the parallel reaction pathways and the common intermediate on ZS-HS.

Direct and Selective Production of Propene from Bio‐Ethanol on Sc‐Loaded In2O3 Catalysts

“…The product distributions might suggest the progress of Equation (10) (and (10') to form ethene) [21] and a notably fast Equation (11), in which ethyl acetate is converted to acetic acid through the hydrolysis of ethyl acetate or the reverse reaction of Fisher esterification [Eq. (10)]. The significant difference between the product distributions in the reactions of ethanol and ethyl acetate, however, was found in Table 1, which was the amount of produced ethene.…”

“…Catalytic conversion of EtOH on zeolites has been widely reported, but the selectivity toward propene was approximately 20-30 % and decreased with reaction time. [10] Random oligomerization and fission reactions on strong acid sites in the zeolite pores are well-known to lead to ethene, propene, and butenes, due to the shape selectivity of the pore windows. However, reactions in the pores eventually result in coke formation and short lifetimes of catalysts.…”

Enhanced stability and propylene yield in methanol to light olefins conversion over nanostructured SAPO‐34/ZSM‐5 composite with various SAPO‐loadings

“…In recent years, production of light olefins has received wide attention due to the increasing global demand for ethylene and propylene . Currently, light olefins production, especially propylene, is not sufficient for world demand . Propylene is one of the most important raw materials in petrochemical industries and recently, due to the rapid increasing demand for it, petrochemical industries are facing a serious supply deficit .…”

“…1,2 Currently, light olefins production, especially propylene, is not sufficient for world demand. 3 Propylene is one of the most important raw materials in petrochemical industries and recently, due to the rapid increasing demand for it, petrochemical industries are facing a serious supply deficit. 4 Light olefins are typically produced using steam cracking and catalytic cracking of higher hydrocarbons and heavy oil.…”

Ultrasonic-assisted hydrothermal synthesis and catalytic behavior of a novel SAPO-34/Clinoptilolite nanocomposite catalyst for high propylene demand in MTO process

“…The catalysts based on Clinoptilolite have been studied in methanol conversion [29], propane dehydrogenation process [30], direct synthesis of dimethyl ether [5], catalyst for the selective catalytic reduction of NOx by ammonia (NH 3 -SCR) [31] and adsorbents [32][33][34][35]. Moreover, the nanocomposites based on SAPO-34 have been studied in propane dehydrogenation process (ZSM-5/SAPO-34 and SAPO-34/ZSM-5) [36], dimethyl ether conversion to light olefins (SAPO-34/ZrO 2 ) [14], ethanol conversion to propylene (HZSM-5/SAPO-34) [37,38], and methanol conversion to olefins (ZSM-5/SAPO-34) [9].…”