The present invention discloses to a method of depositing the metal barrier layer comprising silicon dioxide. The air conditioner includes a main cabinet and a removable air duct. The attaching loop never permanently tightens so the strap assembly is always easily removed. The initial transaction errors are analyzed to determine parameters for identifying other similar errors with a high probability of occurrence within the total population of transactions. This process maintains the sulfur removal activity of the catalyst while reducing the olefin saturation activity.