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AssigneeNone recorded
InventorsJaime SANCHEZ VALENTE, Enelio TORRES GARCIA, Hector ARMENDARIZ HERRERA, Maria de Lourdes Alejandra GUZMAN CASTILLO, Andrea RODRIGUEZ HERNANDEZ, Roberto QUINTANA SOLORZANO, Maiby VALLE ORTA, Jose Manuel LOPEZ NIETO
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A layered multimetallic oxide catalyst having the formula M1 M2 M3 Oδ wherein: M1 is selected from the group of Ag, Au, Zn, Sn, Rh, Pd, Pt, Cu, Ni, Fe, Co, an alkaline metal, an alkaline earth metal, a rare earth metal, and mixtures thereof; M2 is selected from the group of Ti, Hf, Zr, Sn, Bi, Sb, V, Nb, Ta and P, and mixtures thereof; M3 is selected from the group of Mo, W and Cr, and mixtures thereof; and where said multilayered metallic oxide exhibits a major X-ray diffraction peak between 5<2θ<15, is prepared by a process of mixing metallic precursors of M1, M2 and M3 to form a precursor mixture, hydrothermal treatment of the resulting mixture to obtain a homogeneous solid mixture, and thermally treating the solid mixture to activate the solid mixture and obtain said catalyst.
A process for preparing a layered multimetallic oxide catalyst having the formula
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With chromium, molybdenum or tungsten: with molybdenum
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: mixed oxides other than spinels, e.g. perovskite
Chromium, molybdenum or tungsten: molybdenum
With chromium, molybdenum, tungsten or polonium: molybdenum
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The present invention relates to layered multimetallic mixed oxides (LMMO) preparations, which present a layered structure characterized by diffraction peak or peaks between 5<2θ<15, preferably between 10<2θ<15. The presence of additional diffraction peaks is often observed, indicating the existence of extra crystalline phases; some crystalline arrangements were identified as monoclinic lattice of Silver Vanadium Molybdenum Oxide (ICDD-PDF 04-002-4830) or Cesium Vanadium Molybdenum Oxide (ICDD-PDF 00-030-0381) or monoclinic Sodium Vanadium Molybdenum Oxide (ICDD-PDF 04-011-9693) or monoclinic Lithium Vanadium Molybdenum Oxide (ICDD-PDF 04-006-7234) or orthorhombic Calcium Vanadium Molybdenum Oxide (ICDD-PDF 04-013-4035), among others crystalline structures. This invention also relates to the use of the LMMO in the partial oxidation of light hydrocarbons and particularly for the oxidative dehydrogenation of low molecular weight paraffins, preferably between 2 and 4 carbon atoms. More particularly the invention refers to the oxidative dehydrogenation of ethane to ethylene.
The LMMO catalysts of the present invention can be represented by the general formula:
M1 M2 M3 Oδ
FIG. 1 is an X-ray pattern of LiNb0.5V0.5Mo of Example 1 that was calcined in an air static atmosphere at 550° C. for 2 hours.
FIG. 2 is an X-ray pattern of LiVMo of Example 2 that was calcined in an air static atmosphere at 550° C. for 24 hours.
FIG. 3 is an X-ray pattern of Li0.8Zn0.2V1.5Mo0.8 of Example 5 that was calcined in an air static atmosphere at 550° C. for 24 hours.
The present invention is directed to a catalyst and to a process for preparing the catalysts based on layered multimetallic mixed oxides (LMMO), which exhibit a layered structure characterized by at least one X-ray diffraction peak or a plurality of peaks located between 5<2θ<15, and preferably between 10<2θ<15. The presence of additional diffraction peaks may be observed, indicating the existence of other crystalline phases. Crystalline arrangements have been identified as monoclinic lattice of Silver Vanadium Molybdenum Oxide (corresponding to ICDD-PDF 04-002-4830), Cesium Vanadium Molybdenum Oxide (corresponding to ICDD-PDF 00-030-0381), monoclinic Sodium Vanadium Molybdenum Oxide (corresponding to ICDD-PDF 04-011-9693), monoclinic Lithium Vanadium Molybdenum Oxide (corresponding to ICDD-PDF 04-006-7234), and orthorhombic Calcium Vanadium Molybdenum Oxide (corresponding to ICDD-PDF 04-013-4035), among other crystalline structures. This invention also relates to a process for the oxidation or partial oxidation of light hydrocarbons using the LMMO catalysts. The invention is particularly directed to a process for producing ethylene and catalysts for the oxidative dehydrogenation of low molecular weight hydrocarbons, preferably between 2 and 4 carbon atoms. More particularly the invention refers to a process for the oxidative dehydrogenation of ethane to ethylene by contacting a stream of ethane with the catalysts of the present invention.
The LMMO catalysts of the present invention can be represented by the general formula:
M1 M2 M3 Oδ