ORIENTAL JOURNAL OF CHEMISTRY www.orientjchem.org An International Open Free Access, Peer Reviewed Research Journal ISSN: 0970-020 X CODEN: OJCHEG 2018, Vol. 34, No.(4): Pg. 2068-2073 This is an Open Access article licensed under a Creative Commons Attribution-Non Commercial-Share Alike 4.0 International License (https://creativecommons.org/licenses/by-nc-sa/4.0/), which permits unrestricted Non Commercial use, distribution and reproduction in any medium, provided the original work is properly cited. Preparation and Characterization of Chloride-Free Alumina-Supported Platinum Catalysts ANTI KOLONIAL PRODJOSANTOSO Department of Chemistry, Yogyakarta State University, Yogyakarta, DIY 55281, Indonesia. *Corresponding author E-mail: prodjosantoso@uny.ac.id http://dx.doi.org/10.13005/ojc/3404046 (Received: June 12, 2018; Accepted: July 19, 2018) ABSTRACT Supported precious metal catalysts are extensively used as efficient catalysts. This kind of catalysts, particularly chloride-free catalysts, synthesized using organoplatinum compounds as precursors has attracted immense research interest compared to their parent metals due to their unique physico-chemical properties. The main objective of this research is to prepare and characterize the chloride-free alumina-supported platinum catalysts. An organometallic compound of ammonium bisoxalatoplatinate(II) hydrate was used to prepare unsupported and alumina supported platinum catalysts. A series method including IR, XRD, SEM, TEM, EDA, and XPS was used to characterize samples. The research shows that ammonium bisoxalatoplatinate(II) hydrate could be synthesized and used to prepare unsupported and alumina supported platinum free of chloride impurities. Keywords: Catalysts, Platinum, Chloride-free, XPS. INTRODUCTION Organometallic compounds are widely used as catalyst precursor. 1,2 A combination of impregnation of the support with a solution containing the appropriate organometallic species and heat treatment can yield metal and/or metal oxide particles uniformly distributed over the surface of the support. Unfortunately since multi-step reaction pathways are frequently involved, the preparation of particular organometallic precursor is often time consuming. A second problem is that chloride containing species are typically the most easy-prepared organometallics. 3 Thus it is possible that chloride will be present in of the resulting catalysts. 4 Chloride ions have been reported to be absorbed on, and hence block, the active site of metal catalysts. 4–7 As such chloride ions can inhibit a number of metal catalyzed reactions. 8 Removing such chlorides can be both difficult and time consuming since requires additional processing. Potassium bisoxalatometallate complexes are simple chloride-free compounds. Potassium bisoxalatoplatinate(II) is well known and easy to be prepared. 9 This complex can be thermally decomposed at relatively low temperatures to the metal and/or metal oxide, and it is ideal precursors